Replanting the Sierra Nevada after an ecological catastrophe

Given California's changing climate, should Sierra Nevada residents replant pine trees after so many died during the 2010-2016 drought? The short answer is yes, says Susie Kocher, UC Cooperative Extension forestry advisor.

“We have every reason to believe that pines will continue to be an important part of mixed conifer forests in the Sierras,” Kocher said.

Dead trees can be seen in the foreground and on the distant mountain side. (Click on photos for higher resolution.)

Kocher spoke at a meeting for UC Master Gardeners, volunteers who provide landscape advice to the public in California. Questions have been coming in to Master Gardener hotlines from mountain residents wondering what to do after unprecedented tree loses in the last few years.

Most California forests are suffering from severe overcrowding due to 100 years of aggressive fire suppression and selective harvesting of the largest and most resilient trees. They were then subjected to five years of drought.

“There were just too many stems in the ground,” Kocher said. “The drought was very warm, so trees needed more water, but got less. These were optimal conditions for bark beetles.”

Western pine beetle is a native pest that attacks larger ponderosa pine and Coulter pine trees weakened by disease, fire, injury or water stress. Bark beetles are tree species specific, so other beetles target other species of trees in California's mixed conifer forests. Typically, bark beetles bore through tree bark and create long winding tunnels in the phloem. An aggregating pheromone attracts additional bark beetles to the tree, and heavily attacked trees invariably die.

Healthy pine trees can fight off bark beetle attack by secreting pitch. Trees weakened by drought are unable to fend off an attack. In this photo, a pine beetle is stuck in pitch that oozed from the tree.

Evidence of bark beetle attack are exit holes on the outside, left, and winding galleries under the bark.

During the drought, 102 million Sierra Nevada trees died from bark beetle attack or simply lack of water; 68 million of those died in 2016 alone. But after the abundant rainfall in the 2016-17 season, the bark beetle population seems to have crashed.

Landowners with 20 acres or more may be eligible for a state cost-sharing program to remove trees, reduce the fire hazard and replant new seedlings. Landowners in mountain communities who wish to revitalize their properties can contact local UC Master Gardeners for recovery advice.

UC Master Gardeners are plant enthusiasts who have passed an intense training program presented by UC academics. They participate in continuing education annually to update and maintain their knowledge. More than 60 Master Gardeners from Mariposa, Madera and Fresno counties gathered in Oakhurst in October to learn from UC scientists how to work with mountain homeowners whose towering trees have died. Similar training sessions, all funded by a grant from UC Agriculture and Natural Resources, were held in El Dorado and Tuolumne counties in June.

UCCE specialist Jodi Axelson points out bark beetle damage.

“There is life after beetles,” said Jodi Axelson, UC Cooperative Extension forestry specialist at UC Berkeley.

“Eco systems are stretched, and then they come back,” she said. “You must remember the time scale of forest change is long and pines have been a major species in the Sierra Nevada for at least 28,000 years. As long as there have been pines, there have been bark beetles.”

The scientists suggest that people who own forestland take a step back and assess the landscape after their dead trees have been removed.

“We're seeing a lot of young cedar and white fir surviving the drought. Oaks seem to be doing really well,” Kocher said.

She suggests landowners thin young trees so available sun and soil moisture are focused on the healthiest trees. Water seedlings that are receiving more sun than before to reduce stress. Planting native conifers is the best option. Due to climate change, she recommends choosing trees from a slightly lower elevation to hedge against warmer temperatures in the future.

Pines are adapted to the California forest, but may need help to regenerate. When the ground is moist in the late fall or spring, plant seedlings 10 to 14 feet apart. New trees should be planted well away from homes to maintain defensible space and at least 10 feet from power lines.

“Please don't set them up for future torture,” Kocher said. “That's just sad.”

UCCE forestry advisor Susie Kocher, center, speaks during a field trip to a forest where many trees were killed by bark beetles.

To help the new trees become established, cover the ground around the tree, but not touching the bark, with two or three inches of mulch and irrigate weekly during the dry season for the first few years.

Questions about special circumstances may be directed to local UC Master Gardeners. Find the local program here: http://mg.ucanr.edu/FindUs/

Pouch fungus is evidence of a bark beetle kill. The beetles carry fungus into the cambial layer of the tree on their bodies. On recently killed trees, small white conks, the fungus' fruiting body, issues from bark beetle tunnels.

Comments:

1.

I am a forester as well. In your article, you state that people should plant pines. This is somewhat a simple recommendation. California has a very complex pine genotype and is as you know one of the genetic nodes for evolving pine species. I suggest that you help people know that just planting pines is not the way to reforest. I expect that after the fires, natural regenerations will do most of the work anyway. But making the act of reforestation look like simply planting trees is not a sound recommendation. Where is the source of correct pine seedling varieties adapted to the many microhabitats prevalent in California? Where is the seed required for proper planting? Good luck in your work.

Posted
by albert Merkel on October 26, 2017 at 8:01 AM

2.

Hello Al,

Thanks for your comment. Yes, its definitely a bit more complicated than just planting pines. In the workshops we have covered information on natural regeneration, salvage logging, site prep and seed zones, including presentations by a USFS research geneticist. We also talked a little about seed zones and identified locations for buying new trees including the El Dorado County Resource Conservation District's seedling program http://eldoradorcd.org/nodes/info/reforestation.htm. Our workshops focused on tree mortality from bark beetle, and in this case there is typically already a lot of regeneration left. Post fire though, I have more concerns about regeneration especially in areas of high fire severity where no seed trees are left alive. Here are our recent recommendations for post-wildfire actions: http://anrcatalog.ucanr.edu/pdf/8386.pdf. Thanks, Susie